快淬速度对(Nd,Pr)_(10.5)(FeCoZr)_(83.5)B_6显微结构和磁性能的影响  

Effect of quenching rates on microstructure and magnetic properties of (Nd,Pr)_(10.5) (FeCoZr)_(83.5)B_6 bonded composite magnets

作　　者：查五生[1] 刘颖[1] 高升吉[1] 涂铭旌[1] 

机构地区：[1]四川大学材料科学与工程学院

出　　处：《科技通讯（上海）》2004年第1期33-36,共4页

基　　金：国家863计划资助项目(2001AA324030)

摘　　要：采用部分过快淬加后续晶化退火处理工艺,研究了快淬速度对低稀土含量双相复合(Nd,Pr)10.5(FeCoZr)83.5B6合金显微结构和粘结磁体磁性能的影响。合金快淬转轮线速度为24,26,28和30m·s-1,退火温度655～715℃,退火时间5～20min。快淬速度直接影响条带的显微结构和磁体磁性能。以26m·s-1速度快淬出的条带,快淬态由非晶和微晶混合组成,在700℃经10min晶化处理,可获得平均晶粒尺寸约30nm的均匀、细小显微组织,磁性能也最佳。用3.25wt%环氧树脂粘结的磁体磁性能为:Br=0.703T,Hci=544kA·m-1,Hcb=351kA·m-1,(BH)m=70kJ·m-3。By using sub -overquenching and ann ealing methods,the effect of quench ing rates on the microstructure and the magnetic pro perties of(Nd,Pr ) 10.5 (FeCoZr ) 83.5 B 6 bonded composite magnets with low rare -earths content was investi gated.The melted alloy were spun int o ribbons at 24,26,28,30m·s -1 wheel surface speed and then the ribb ons were annealed at 655～715℃for 5～20min.Spun at 26m·s -1 ,the as -spun ribbons consist of amorphous phases mixed with fine crystallites.And after crystallization in 700℃for 10min,the ribbons have a finer average grain size(about 30nm on free surface)and a more homogeneous microstructu re.The optimal magnetic properties of bonded magnets reaching B r =0.703T,H ci =544kA·m -1 ,H cb =351kA·m -1 ,(BH) m =70kJ·m -3 were obtained by bonding with 3.25wt%epoxy.

关 键 词：纳米晶复合磁体 快淬速度 显微结构 磁性能 晶化退火 粘结磁体 

分 类 号：TM27[一般工业技术—材料科学与工程]